Essentially, this means the UK is screwed for any more events. This new company will control the entire Pokemon franchise outside of Asia, while Pokemon UK was expected to control the whole of Europe and was incompetent at that to begin with. Most of Europe got a poor showing of any events, and even though the Shaymin event in the UK this Easter has been a pretty good run - it's a rarity and is looking to become even more of a rarity after this merger.
Now that the entire non-Japanese world is under the control of one single company, it's more or less guaranteed that the UK, if not Europe in general, will be completely ignored the same way Canada has been throughout PUSA's run over the Americas.
If we get Arceus next year, we'll be extremely lucky. If we get it even to half the standard we've received Shaymin this year, it'll be a damned miracle.